Move filename validation out of the Router and into the FilesAdaptor (#6157)

* Move filename validation out of the Router and into the FilesAdaptor

* Address PR comments

* Update unittests to handle FilesAdapter interface change

* Make validateFilename optional

spec/FilesController.spec.js

@@ -4,6 +4,8 @@ const WinstonLoggerAdapter = require('../lib/Adapters/Logger/WinstonLoggerAdapte
   .WinstonLoggerAdapter;
 const GridFSBucketAdapter = require('../lib/Adapters/Files/GridFSBucketAdapter')
   .GridFSBucketAdapter;
+const GridStoreAdapter = require('../lib/Adapters/Files/GridStoreAdapter')
+  .GridStoreAdapter;
 const Config = require('../lib/Config');
 const FilesController = require('../lib/Controllers/FilesController').default;
 
@@ -14,6 +16,7 @@ const mockAdapter = {
   deleteFile: () => {},
   getFileData: () => {},
   getFileLocation: () => 'xyz',
+  validateFilename: () => {},
 };
 
 // Small additional tests to improve overall coverage
@@ -118,4 +121,22 @@ describe('FilesController', () => {
 
     done();
   });
+
+  it('should reject slashes in file names', done => {
+    const gridStoreAdapter = new GridFSBucketAdapter(
+      'mongodb://localhost:27017/parse'
+    );
+    const fileName = 'foo/randomFileName.pdf';
+    expect(gridStoreAdapter.validateFilename(fileName)).not.toBe(null);
+    done();
+  });
+
+  it('should also reject slashes in file names', done => {
+    const gridStoreAdapter = new GridStoreAdapter(
+      'mongodb://localhost:27017/parse'
+    );
+    const fileName = 'foo/randomFileName.pdf';
+    expect(gridStoreAdapter.validateFilename(fileName)).not.toBe(null);
+    done();
+  });
 });